[Greg Wright]

Out of balance wheel?

 

[doslislo]

Thanks for the response. I Do not think that is issue – note it happens for about 1 second and then goes away.  Almost like if you were going over rumple strips in road.  After the 45 it is gone.  It is very consistent, but only for short period of time.

[Matt Martin]

some kind of problem with balance – wheels or otherwise.  If it’s consistently 45mph it’s some sort of resonant frequency caused by rotational parts – engine (rpm), clutch, wheels, brakes, chain, sprocket, etc.

 

Or, if you happen to be at 45mph at the same point on the track each time, it could be track related.

[doslislo]

I guess I have to figure out where to start.  I took the clutch off and it didn’t look to be noticeable bad.

[Jim White]

Could you be hitting the rev limiter at the end of the straight?

[tony zambos]

Make a significant change in your gear ratio to determine if the shutter occurs at the same speed or same RPM.
Check for worn gears, worn chain or too much slack in the chain.

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